DEBIAN-CVE-2026-91990

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Source
https://security-tracker.debian.org/tracker/CVE-2026-91990
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91990.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-91990
Upstream
Published
2026-09-15T16:17:58Z
Modified
2026-09-16T05:00:10Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.

References

Affected packages

Debian:12 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.2.0-3
6.2.0-3+deb12u1
6.2.0-3+deb12u2
6.2.0-3+deb12u3
6.2.0-3+deb12u4
6.3.2-1
6.4.0-1
6.4.0-2
6.4.1-1
6.4.1-2
6.4.1-3
6.4.2-1
6.4.2-2
6.4.2-3
6.5.2-1
6.5.2-2
6.5.2-3
6.5.4-0.1
6.5.4-1
6.5.5-1
6.5.5-2
6.5.5-3
6.5.5-4
6.5.5-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91990.json"

Debian:13 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.4.2-3
6.4.2-3+deb13u1
6.4.2-3+deb13u2
6.5.2-1
6.5.2-2
6.5.2-3
6.5.4-0.1
6.5.4-1
6.5.5-1
6.5.5-2
6.5.5-3
6.5.5-4
6.5.5-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91990.json"

Debian:14 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.4.2-3
6.5.2-1
6.5.2-2
6.5.2-3
6.5.4-0.1
6.5.4-1
6.5.5-1
6.5.5-2
6.5.5-3
6.5.5-4
6.5.5-5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91990.json"